请教下UBNT NB5出现的故障

cgj***

UBNT NB5 AR7240+AR9280 用TTL打开出现如下：

U-Boot 1.1.4.2-s594 (Dec  5 2012 - 15:23:07)

Board: Ubiquiti Networks XM board (rev 1.0 e2b5)
DRAM:  32 MB
Flash:  8 MB
PCIe WLAN Module found (#1).
Net:   eth0, eth1
Hit any key to stop autoboot:  0
Setting default IP 192.168.1.20
Starting TFTP server...
Using eth0 (192.168.1.20), address: 0x81000000
Will reset device configuration (Reset button active after 10 seconds).
find_mtd_part
Clearing partition 'cfg':
        erasing range 0x9F7B0000..0x9F7EFFFF: .... done
Erased 4 sectors
Waiting for connection: | 停留在这里 按Ctrl+C可以切换到 AR7240>
这是什么问题了，请高手支招。有救没 正常使用下出现的问题，IP登入不了。谢谢